Figure 9

Langmuir and Freundlich isotherm models fit of GO, TW, GOTW and rGO/Fe₃O₄/TW at 298 K (a) and the isotherm models fit of rGO/Fe₃O₄/TW at different temperature (298 K-333 K) (b). pH = 5.0, C_(U)initial = 5-150 mg/L, C_sorbent = 0.5 g/L, contact time = 24 h.